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Evenly Spaced Dashes with StrokeDashArray

<Grid x:Name="LayoutRoot" Background="Transparent">

    <Grid.RowDefinitions>

        <RowDefinition Height="Auto"/>

        <RowDefinition Height="*"/>

    </Grid.RowDefinitions>

    <Ellipse Fill="#FFC83838" Margin="112,253,128,275" Grid.Row="1" Stroke="#FFC83838" StrokeThickness="3"/>

    <Ellipse Fill="#FFC83838" Margin="112,253,128,275" Grid.Row="1" Stroke="White" StrokeThickness="30" StrokeDashArray="1.79" StrokeDashOffset="6" RenderTransformOrigin="0.5,0.5"/>

</Grid>

       

2*p*r = n*(T*S+T*G)

       

S+G = 2pr/nT

       

G = 2pr/180 - 1

       

StrokeDashArray="1,2.58"